Gearing advice please

Discussion in 'Hubs, Gearboxes, Sprockets and Chains' started by PsychDoc, Nov 9, 2019.

  1. PsychDoc

    PsychDoc Member

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    Gear ratio check

    Am I doing this right (or close enough)
    Engine to tav2 or equivalent to rear sprocket
    Engine rpm range roughly 2000-5000 keeping it conservative
    The TAV2 starts at a 1:3 and progressively goes to 1:1- drives a 10 or 12 tooth sprocket.
    26” rear tire

    So say I have a 50 tooth rear
    So the trans engages at around 2000- to a 1:3- 10 tooth- to the 50tooth rear equals a 15:1 total and 10.35mph
    Max speed 5000rpm trans is now 1:1 overall ratio 1:5 and I’m at 77+mph

    (Note to self- larger rear sprocket)

    I’m using this page- https://electricscooterparts.com/motor-jackshaft-wheel-gear-ratio.html
     

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  2. Tony01

    Tony01 Well-Known Member

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    That thing will never hit 77mph don’t you worry.
     
    #2 Tony01, Nov 9, 2019
    Last edited: Nov 9, 2019
  3. PsychDoc

    PsychDoc Member

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    No- 77mph is neither desired nor reasonably possible. Just talking it through
     
  4. MotoMagz

    MotoMagz Well-Known Member

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    I like running the tav with a rear WHIZZER sheave. It’s a all around great ride.
     
  5. Tony01

    Tony01 Well-Known Member

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    nsr you can run the 5:1 but you’ll always be shifting. It does rev a bit during shifting but only maybe 1200rpm. Won’t blow but the ride is meh
     

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